提出 #73562184

---

ソースコード 拡げる

#include <bits/stdc++.h>
#include <cctype>
#include <queue>
using namespace std;

#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

struct Init { Init() { ios::sync_with_stdio(0); cin.tie(0); } }init;

using ll = long long;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
#define rep(i,l,r) for (ll i = (ll)l; i < (ll)r; i++)



int main(){
    Init();
    ll N;
    cin >> N;
    vector<ll> A(N);
    vector<bool> searched(N, false);
    
    rep(i, 0, N){
        cin >> A[i];
    }

    vector<ll> ids(N);
    iota(ids.begin(), ids.end(), N);
    sort(ids.begin(), ids.end(), [&](int i, int j){return A[i] < A[j];});

    rep(i, 0, N-1){
        if(A[ids[i]] == A[ids[i+1]] and A[ids[i]]+1 == A[ids[i+1]]){
            continue;
        }
        else{
            searched[ids[i]];
        }
    }

    ll max_length = 1;
    rep(i, 0, N){
        if(searched[i]){
            continue;
        }
        ll length = 1;
        ll id = i;
        rep(j, id, N){
            if (A[j] == A[id] + 1){
                searched[j] = true;
                id = j;
                length++;
                max_length = max(max_length, length);
            }
        }

    }
    cout << max_length << endl;

}

提出情報

コンパイルエラー

./Main.cpp: In function 'int main()':
./Main.cpp:41:28: warning: ignoring return value of 'constexpr std::vector<bool, _Alloc>::reference std::vector<bool, _Alloc>::operator[](size_type) [with _Alloc = std::allocator<bool>; reference = std::vector<bool>::reference; size_type = long unsigned int]', declared with attribute 'nodiscard' [-Wunused-result]
   41 |             searched[ids[i]];
      |                            ^
In file included from /opt/atcoder/gcc/include/c++/15.2.0/vector:69,
                 from /opt/atcoder/gcc/include/c++/15.2.0/functional:66,
                 from /opt/atcoder/gcc/include/c++/15.2.0/x86_64-pc-linux-gnu/bits/stdc++.h:55,
                 from ./Main.cpp:1:
/opt/atcoder/gcc/include/c++/15.2.0/bits/stl_bvector.h:1156:7: note: declared here
 1156 |       operator[](size_type __n)
      |       ^~~~~~~~

ジャッジ結果